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||out Network|| > V-Ray Render Elements node > V-Ray > Render Channel > Bump Normals

Denoising Engines

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VRayDenoiser offers a choice between the Default V-Ray denoiser and the NVIDIA AI denoiser. Each offers a different denoising algorithm that comes with different benefits. See the denoising engine examples below.

Default V-Ray denoiser - V-Ray's denoising algorithm. It can utilize the CPU or the GPU (AMD or NVIDIA GPUs) to perform the denoising. It is consistent when denoising render elements, as it applies the same denoising operator to all render channels, which means that it is recommended for denoising the render elements to be used for compositing back the beauty image. In addition, it comes with a standalone version, which is recommended for denoising animation by using frame blending.

NVIDIA AI denoiser - V-Ray's integration of NVIDIA's  AI-based denoising algorithm. The NVIDIA AI denoiser requires an NVIDIA GPU to work, regardless of whether the actual rendering was performed on the CPU or GPU. This means that rendering on the CPU will still require an NVIDIA GPU for denoising with the NVIDIA AI denoiser and has some advantages and drawbacks compared to the Default V-Ray Denoiser. For example, the NVIDIA AI denoiser performs the denoising faster, but is not consistent when denoising render elements. This means that there will be differences between the original RGB image and the one reconstructed from render elements that are denoised with the NVIDIA AI denoiser. It also doesn't support cross-frame denoising and will likely produce flickering when used in animation.

Parameters

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Image Modified

Use GPU – Enables the usage of GPU if an OpenCL videocard is found.

Name – The text added to the end of the rendered file, when saved as a separate file (e.g. myrender.Denoiser.vrimg).

Engine – Allows choosing between the Default V-Ray denoiser and the NVIDIA AI denoiser. See the denoising engine  examples below.

Preset – When using the Default V-Ray denoiser, the presets can be used to automatically set the Strength and Radius values.

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Type – Specifies which channels to denoise.

RGB Only
All Channels

Radius – Specifies the area around each pixel to be sampled for determining how to denoise a given pixel. Larger values produce smoother results, but slow down the denoiser.

Strength – Determines how strong the denoising operation will be. Larger values remove noise more aggressively, but may blur the image too much.

Generate Render Elements – Adds specific render elements that help the denoiser be more effective.

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Example: Default V-Ray denoiser

The example below illustrates how the Default V-Ray denoiser works after more samples are made with the Progressive image sampler. When the samples are too few, the're not enough information for the denoising to produce a smooth result.

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Example: NVIDIA AI denoiser

The example below illustrates how the NVIDIA AI denoiser works after more samples are made with the Progressive image sampler. When the samples are too few, there's not enough information for the denoising to produce a smooth result.

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